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Finding the Fourth Proportional to 198.20, 297.25 and 53.88

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Solution

The fourth proportional to 198.20, 297.25 and 53.88 is: 80.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.20 : 297.25 = 53.88 : x
  2. Step 2: Convert to fraction form
    198.20/297.25 = 53.88/x
  3. Step 3: Cross multiply
    198.20x = 297.25 × 53.88
  4. Step 4: Simplify right side
    198.20x = 16,015.83
  5. Step 5: Solve for x
    x = 16,015.83/198.20
  6. Step 6: Final answer
    x = 80.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.